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Financial Instruments - Summary of Loss Allowance Provision (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 1.5 | $ 2.1
Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | 1,356.9 |
Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 1.9 |
Current [member] |  |
Disclosure of provision matrix [line items] |  |
Expected loss rate | 0.07% |
Current [member] | Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 936.5 |
Current [member] | Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 0.7 |
Later than one month and not later than two months [member] |  |
Disclosure of provision matrix [line items] |  |
Expected loss rate | 0.10% |
Later than one month and not later than two months [member] | Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 228.7 |
Later than one month and not later than two months [member] | Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 0.2 |
Later than two months and not later than three months [member] |  |
Disclosure of provision matrix [line items] |  |
Expected loss rate | 0.22% |
Later than two months and not later than three months [member] | Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 63.8 |
Later than two months and not later than three months [member] | Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 0.1 |
Later than three months and not later than four months [member] |  |
Disclosure of provision matrix [line items] |  |
Expected loss rate | 0.43% |
Later than three months and not later than four months [member] | Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 43.2 |
Later than three months and not later than four months [member] | Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 0.2 |
Later than four months [member] |  |
Disclosure of provision matrix [line items] |  |
Expected loss rate | 0.75% |
Later than four months [member] | Gross carrying amount [member] |  |
Disclosure of provision matrix [line items] |  |
Gross carrying amount | $ 84.7 |
Later than four months [member] | Accumulated impairment [member] |  |
Disclosure of provision matrix [line items] |  |
Loss allowance provision, end of the year | $ 0.7 |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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- Definition The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph IG20D -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_IG20D&doctype=Implementation%20Guidance -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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